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Four people were killed in a Potsdam clinic.
A police spokesman said on Wednesday evening that they died as a result of "external violence".
Another person was also seriously injured by external violence.
According to WELT information, the crime scene should be a house on the clinic premises where people with disabilities are treated.
A 51-year-old woman was arrested on urgent suspicions.
The police initially did not provide any details about their identity.
According to information from the "Tagesspiegel", the dead are said to have been patients.
There was initially no official confirmation of this.
Police cars and ambulances were parked in front of the Oberlinklinik on Rudolf-Breitscheid-Strasse.
The emergency services have been in action since shortly before 9 p.m.
The emergency pastoral care was also on site.
Police officers were standing in front of a building on the clinic premises.
It was not disclosed whether the victims were patients.
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The Oberlinklinik in the Babelsberg district is a specialist orthopedic clinic.
According to the information on the website, it has around 300 employees.
In 2018 the clinic had 162 beds.